// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_AUDIO_PULSE_AUDIO_MANAGER_PULSE_H_
#define MEDIA_AUDIO_PULSE_AUDIO_MANAGER_PULSE_H_

#include <pulse/pulseaudio.h>
#include <string>

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "media/audio/audio_manager_base.h"

namespace media {

class MEDIA_EXPORT AudioManagerPulse : public AudioManagerBase {
public:
    AudioManagerPulse(
        scoped_refptr<base::SingleThreadTaskRunner> task_runner,
        scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
        AudioLogFactory* audio_log_factory);

    bool Init();

    // Implementation of AudioManager.
    bool HasAudioOutputDevices() override;
    bool HasAudioInputDevices() override;
    void ShowAudioInputSettings() override;
    void GetAudioInputDeviceNames(AudioDeviceNames* device_names) override;
    void GetAudioOutputDeviceNames(AudioDeviceNames* device_names) override;
    AudioParameters GetInputStreamParameters(
        const std::string& device_id) override;
    const char* GetName() override;

    // Implementation of AudioManagerBase.
    AudioOutputStream* MakeLinearOutputStream(
        const AudioParameters& params,
        const LogCallback& log_callback) override;
    AudioOutputStream* MakeLowLatencyOutputStream(
        const AudioParameters& params,
        const std::string& device_id,
        const LogCallback& log_callback) override;
    AudioInputStream* MakeLinearInputStream(
        const AudioParameters& params,
        const std::string& device_id,
        const LogCallback& log_callback) override;
    AudioInputStream* MakeLowLatencyInputStream(
        const AudioParameters& params,
        const std::string& device_id,
        const LogCallback& log_callback) override;

protected:
    ~AudioManagerPulse() override;

    AudioParameters GetPreferredOutputStreamParameters(
        const std::string& output_device_id,
        const AudioParameters& input_params) override;

private:
    bool InitPulse();
    void DestroyPulse();

    void GetAudioDeviceNames(bool input, media::AudioDeviceNames* device_names);

    // Callback to get the devices' info like names, used by GetInputDevices().
    static void InputDevicesInfoCallback(pa_context* context,
        const pa_source_info* info,
        int error, void* user_data);
    static void OutputDevicesInfoCallback(pa_context* context,
        const pa_sink_info* info,
        int error, void* user_data);

    // Callback to get the native sample rate of PulseAudio, used by
    // UpdateNativeAudioHardwareInfo().
    static void AudioHardwareInfoCallback(pa_context* context,
        const pa_server_info* info,
        void* user_data);

    // Called by MakeLinearOutputStream and MakeLowLatencyOutputStream.
    AudioOutputStream* MakeOutputStream(const AudioParameters& params,
        const std::string& device_id);

    // Called by MakeLinearInputStream and MakeLowLatencyInputStream.
    AudioInputStream* MakeInputStream(const AudioParameters& params,
        const std::string& device_id);

    // Updates |native_input_sample_rate_| and |native_channel_count_|.
    void UpdateNativeAudioHardwareInfo();

    pa_threaded_mainloop* input_mainloop_;
    pa_context* input_context_;
    AudioDeviceNames* devices_;
    int native_input_sample_rate_;
    int native_channel_count_;

    DISALLOW_COPY_AND_ASSIGN(AudioManagerPulse);
};

} // namespace media

#endif // MEDIA_AUDIO_PULSE_AUDIO_MANAGER_PULSE_H_
